Quasi-static and cyclic interlaminar cracking behavior of glass fiber/MWCNT/epoxy hybrid composites

Research output: Contribution to journalConference article

Abstract

The objective of this investigation is to evaluate the effect of multi-walled carbon nanotubes (MWCNTs) on the interlaminar cracking behavior of S-2 Glass fiber reinforced composites made with two different carbon nanotube modified epoxy matrix materials in quasi-static and cyclic loadings. Two types of MWCNTs were used: pristine long CNTs and carboxyl-functionalized short CNTs (COOH-CNTs). COOH-CNTs were also mixed into epoxy at 2 weight % and applied as a discrete interlayer between fiber reinforced plies. The mode I and mode II interlaminar cracking behaviors in quasi-static and cyclic loadings were characterized by the double cantilever beam (DCB) specimens and the end-notched flexure (ENF) tests, respectively. The quasi-static test results showed improvement in mode I onset fracture toughness by adding either type of CNTs and improvement in mode II onset fracture toughness by adding COOH-CNTs. The cyclic test results showed slower crack growth rate in both mode I and mode II cyclic loading for the COOH-CNT reinforced composite. Microscope analysis of the fracture surfaces showed better dispersion of the COOH-CNTs than the pristine CNTs in the epoxy resin.

Original languageEnglish (US)
Pages (from-to)1851-1864
Number of pages14
JournalAnnual Forum Proceedings - AHS International
Volume3
StatePublished - Nov 15 2010
Event66th Forum of the American Helicopter Society: "Rising to New Heights in Vertical Lift Technology", AHS Forum 66 - Phoenix, AZ, United States
Duration: May 11 2010May 13 2010

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Glass fibers
Carbon nanotubes
Fracture toughness
Composite materials
Cantilever beams
Epoxy resins
Crack propagation
Microscopes
Fibers

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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title = "Quasi-static and cyclic interlaminar cracking behavior of glass fiber/MWCNT/epoxy hybrid composites",
abstract = "The objective of this investigation is to evaluate the effect of multi-walled carbon nanotubes (MWCNTs) on the interlaminar cracking behavior of S-2 Glass fiber reinforced composites made with two different carbon nanotube modified epoxy matrix materials in quasi-static and cyclic loadings. Two types of MWCNTs were used: pristine long CNTs and carboxyl-functionalized short CNTs (COOH-CNTs). COOH-CNTs were also mixed into epoxy at 2 weight {\%} and applied as a discrete interlayer between fiber reinforced plies. The mode I and mode II interlaminar cracking behaviors in quasi-static and cyclic loadings were characterized by the double cantilever beam (DCB) specimens and the end-notched flexure (ENF) tests, respectively. The quasi-static test results showed improvement in mode I onset fracture toughness by adding either type of CNTs and improvement in mode II onset fracture toughness by adding COOH-CNTs. The cyclic test results showed slower crack growth rate in both mode I and mode II cyclic loading for the COOH-CNT reinforced composite. Microscope analysis of the fracture surfaces showed better dispersion of the COOH-CNTs than the pristine CNTs in the epoxy resin.",
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Quasi-static and cyclic interlaminar cracking behavior of glass fiber/MWCNT/epoxy hybrid composites. / Zhu, Ye; Bakis, Charles E.

In: Annual Forum Proceedings - AHS International, Vol. 3, 15.11.2010, p. 1851-1864.

Research output: Contribution to journalConference article

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AU - Bakis, Charles E.

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N2 - The objective of this investigation is to evaluate the effect of multi-walled carbon nanotubes (MWCNTs) on the interlaminar cracking behavior of S-2 Glass fiber reinforced composites made with two different carbon nanotube modified epoxy matrix materials in quasi-static and cyclic loadings. Two types of MWCNTs were used: pristine long CNTs and carboxyl-functionalized short CNTs (COOH-CNTs). COOH-CNTs were also mixed into epoxy at 2 weight % and applied as a discrete interlayer between fiber reinforced plies. The mode I and mode II interlaminar cracking behaviors in quasi-static and cyclic loadings were characterized by the double cantilever beam (DCB) specimens and the end-notched flexure (ENF) tests, respectively. The quasi-static test results showed improvement in mode I onset fracture toughness by adding either type of CNTs and improvement in mode II onset fracture toughness by adding COOH-CNTs. The cyclic test results showed slower crack growth rate in both mode I and mode II cyclic loading for the COOH-CNT reinforced composite. Microscope analysis of the fracture surfaces showed better dispersion of the COOH-CNTs than the pristine CNTs in the epoxy resin.

AB - The objective of this investigation is to evaluate the effect of multi-walled carbon nanotubes (MWCNTs) on the interlaminar cracking behavior of S-2 Glass fiber reinforced composites made with two different carbon nanotube modified epoxy matrix materials in quasi-static and cyclic loadings. Two types of MWCNTs were used: pristine long CNTs and carboxyl-functionalized short CNTs (COOH-CNTs). COOH-CNTs were also mixed into epoxy at 2 weight % and applied as a discrete interlayer between fiber reinforced plies. The mode I and mode II interlaminar cracking behaviors in quasi-static and cyclic loadings were characterized by the double cantilever beam (DCB) specimens and the end-notched flexure (ENF) tests, respectively. The quasi-static test results showed improvement in mode I onset fracture toughness by adding either type of CNTs and improvement in mode II onset fracture toughness by adding COOH-CNTs. The cyclic test results showed slower crack growth rate in both mode I and mode II cyclic loading for the COOH-CNT reinforced composite. Microscope analysis of the fracture surfaces showed better dispersion of the COOH-CNTs than the pristine CNTs in the epoxy resin.

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